a shortage of labour的用法和样例：
- The pests spread quickly in these regions and there was a shortage of labour.
- The war was lost because of a shortage of munitions.
- There is a shortage of salt in this country.
- There was a shortage of oxygen at the top of the mountain.
- Spending too much now will mean a shortage of cash next year.
- If there is a shortage of any product prices of that product go up.